One Sunday morning in May, after leaving a restaurant in western Mexico, Sergio Emmanuel Martínez was kidnapped. Two weeks earlier, he had started work as a senior director of customs in Manzanillo, the country’s largest port.
The next day, he was found dead beside a motorway, making him the fourth customs official at the port to be murdered in less than two years.
Manzanillo is a bustling centre of global commerce but it is also an entry point for chemicals from China that are used to make the synthetic opioid fentanyl.
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